Select true or false for each statement.
1. for a real number a, a + 0 = a.
2. for a real number a, a + (-a) = 1.
3. for a real numbers a and bla-bl=1b-al.
4. for real numbers a, b, and c, a +(bº c) = (a + b)(a + c).
5. for rational numbers a and b when b# o,
is always a rational number.

1. True

2. False

3. True

4. False

5. True

Step-by-step explanation:

1. For a real number a, a + 0 = a.

This is true, any number plus zero is that number.

2. For a real number a, a + (-a) = 1.

This is false.  Adding a negative number is the same as subtracting that number. So a + (-a) = a - a = 0

3. For a real numbers a and b la-bl = |b-al.

This is true.  Absolute value represents the distance between two numbers.  This number can never be negative, therefore la-bl = |b-al.

4. For real numbers a, b, and c, a +(bº c) = (a + b)(a + c).

False.  a + (b * c) = a + bc.

If you foil (a + b)(a + c) you will see its equal to a²+ab+ac+bc, which is definitely  different than a + (b*c)

5. For rational numbers a and b when b# o, is always a rational number.

True, a rational number is one that can be written as a fraction with two integers.  The quotient of two rational numbers can always be written as a fraction with integers.

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )